pair-st-lines

Question: The lines ${{(lx+my)}^{2}}-3{{(mx-ly)}^{2}}=0$ and $lx+my+n=0$ form



1) An isosceles triangle
2) A right angled triangle
3) An equilateral triangle
4) None of these
Solution: Explanation: No Explanation
Angle between the pair of straight lines Condition for parallel and perpendicular lines

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